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Show 402 DR. B. 0. A. WINDLE AND MR. F. G. PARSONS ON THE [Apr. 6, civetta (12, 13), Genetta (16), Herpestes (22, 24), Canis familiaris (31, 38, 39), Ursus arctos (47), U. americanus (48, 49, 51, 52), U. marltlmus (45), Procgon lotor (53), P. cancrivorus (57), Nasua (60. 60 a), Cercoleptes (61), Gallctls vittata (63), Mustela putorius (65), 31. folna (66, 67), A/<^s (71, 72, 73), and Lutra (74, 75, 76, 77, 78, 7iJ). In the following animals tendons were only supplied to the annularis and minimus:-Felis leo (1), in which the extensor minimi and the extensor quarti digiti are separate muscles and lie in distinct sheaths, Genettta (17), Herpestes (23), Proteles (25), Hycena striata (26), H. crocuta (29), and Canis aureus (41). In Ictonyx libyca (70) two tendons were found, but these went to the medius and annularis. In Cyncelurus (9) Ross describes only one tendon to the second phalanx of the fifth digit, but he says that there is also an " extensor minimi digiti tertii " rising from the upper fifth of the radius and passing through a separate sheath of the annular ligament to the 1st phalanx of the minimus (IV.). Extensor carpi ulnaris.-This muscle has the human attachments and is extremely constant. The only point of interest which we have come across is that Meckel (XXXIX.) describes it as double in the White Bear ; it must be borne in mind, however, that in the Bears the flexor carpi ulnaris is double, so that there may be some confusion between the two muscles. Supinator brevis.-This consists, as in most mammals below the Primates, of one layer, which lies superficial to the posterior interosseous nerve; it rises from the orbicular and external lateral ligament, and in some cases reaches as high as the external condyle. It is inserted into the outer side of the radius, reaching a greater distance in some animals than in others. In the Felidae our records of this muscle are very scanty, but it seems usually to occupy the upper third of the forearm. In the Viverridae it occupies the upper third in Cryptoprocta (10) and Genetta (18); in Viverra civetta (12,13) it is merely described as well marked, while in Herpestes (22, 24) it was found in the upper two-thirds of the forearm. In the Hyaenidae it seems to be only slightly developed (26, 28, 29), and Watson (XIII.) does not mention it at all in his description of Proteles. In the Canidae, Meckel (XXXIX.) describes it as occupying the upper half of the forearm, but in other specimens (31, 39) it did not extend so far down. The Ursidae are remarkable for the great development of the supinator brevis ; in Ursus marltlmus (45) it reaches to within 1| inches of the lower end of the radius, while in U. americanus (48, 49, 52) it occupies the upper two-thirds to three-quarters. Among the Procyonidae it covered the upper half of the radius in Procyon lotor (53, 56) and Nasua (60), the upper third in P. lotor (54) and Cercoleptes (61). Allen (XXVI.) describes it as being pierced by the posterior muscular branch of the musculo-spiral nerve (posterior interosseous ?), an arrangement which was not present in our specimen of Procyon and which we have never seen in any other Carnivore. In the Mustelidae the length of the muscle varies. Macalister describes it as well marked in Galictis harbara |
